Question

(a) Draw a diagram to show the refraction of light through a glass prism. On this diagram, mark
1. incident ray
2. emergent ray, and
3. angle of deviation.
(b) What is a rainbow? What are the two conditions necessary for the formation of a rainbow in the sky?
(c) What acts as tiny prisms in the formation of a rainbow?
(d) Name the process which is involved in the formation of a rainbow.
(e) What are the seven colours seen in a rainbow?

Answer 1

(b) Rainbow is an arch of seven colours visible in the sky which is produced by the dispersion of sun's light by raindrops in the atmosphere. A rainbow is formed in the sky when the sun is shining and it is raining at the same time.
(c) Raindrops
(d) Dispersion of light
(e) Red, Orange, Yellow, Green, Blue, Indigo and Violet.